Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c62fc236377d81e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 01:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b2ee8f9c36443e0794a9c3dc15620755 SHA-1: 0be93edb25b0cc558a37ca6a983391c15e028201 SHA-256: 7c62fc236377d81e1478bb1abc6ec310af17bb3822ca658240e1127e6c790e54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dorp.pl/userfiles/files/39170569801.pdf In PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/taropujadokirubot.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/21372116499.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/78870113345.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/setibagis.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/83774721660.pdfIn PDF document text
    • http://seamacros.com/upload/file/31849605775.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/zidijozep.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/sinowiruw.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/jawojewevoxamefidok.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gojenev.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081b1a62fe---texokosiw.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/zixugesovubipuwi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/josawavarusiduj.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/kipaxijivul.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dofixow.pdfIn PDF document text
    • http://santeh.md/img/files/nozepuset.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/fagizizapidofivuvagis.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/57513206008.pdfIn PDF document text
    • http://strandedtattoo.info/file/fetotubibagidit.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/nofemevolutunaxi.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/57599466839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=idle+tycoon+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63E 19496 bytes
SHA-256: d451d31945c7c26d9b4ee4c97d622813171b10a3e13c7e4dec3e79eb4a504fbe
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10472 bytes
SHA-256: ebda0549e4118501fe46108dfec396ebd69e86885040f9cb5f832e7aac942624

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